Quick answer
Regulus is a boy name meaning "prince, little king".
Pronunciation: Latin /ˈreː.ɡu.lus/.
Meaning and history
Roman cognomen meaning "prince, little king", a diminutive of Latin rex "king". This was the cognomen of several 3rd-century BC consuls from the gens Atilia. It was also the name of several early saints. A star in the constellation Leo bears this name as well.
Notes and context
Usage: ancient roman, astronomy